Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é a contagem de traços com radical 皿 frequência menor que 129?
 ###Tabelas: CREATE TABLE seasonal_ratings_broadcast_history (seasonal_ratings_broadcast_history_id AUTO_INCREMENT PRIMARY KEY, Season INT, Network VARCHAR, Time slot VARCHAR, Season premiere VARCHAR, Season finale VARCHAR, Episode count INT, TV season VARCHAR, Season rank VARCHAR, Viewers (in millions) INT) CREATE TABLE non-mammalian (non-mammalian_id AUTO_INCREMENT PRIMARY KEY, Name VARCHAR, Novelty VARCHAR, Status VARCHAR, Authors VARCHAR, Location VARCHAR) CREATE TABLE table_of_radicals (table_of_radicals_id AUTO_INCREMENT PRIMARY KEY, Radical (variants) VARCHAR, Stroke count INT, Pīnyīn VARCHAR, Hiragana - Romaji VARCHAR, Meaning VARCHAR, Frequency INT, Examples VARCHAR) CREATE TABLE week_three (week_three_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Time VARCHAR, Visiting team VARCHAR, Home team VARCHAR, Site VARCHAR, Broadcast VARCHAR, Result VARCHAR, Attendance INT) CREATE TABLE rs_series_b-b (rs_series_b-b_id AUTO_INCREMENT PRIMARY KEY, Model VARCHAR, Specification VARCHAR, Build date VARCHAR, Total produced INT, Wheel arrangement VARCHAR, Prime mover VARCHAR, Power output VARCHAR)  
SELECT AVG Stroke count FROM table_of_radicals WHERE Radical (variants) = 皿 AND Frequency < 129